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17 

Appendix D. Addressable Systems 

 

The Addressable system allows all the borehole sensors to be connected to a single cable rather 

than have a separate cable for each sensor. The sensors are supplied in a string connected 

together by pre-determined lengths of cables specified by the customer. 

 

The string of sensor is installed in a manner to that described in Section 2. 

 

The cable is connected, via a 15-pin connector, to a special Geokon Model 8021-1X datalogger 

modified, by the addition of a Model 8031 Distributed Multiplexer, specifically for use with the 

addressable system 

 

 

 

Summary of Contents for 6300

Page 1: ... by any means without the written consent of Geokon The information contained herein is believed to be accurate and reliable However Geokon assumes no responsibility for errors omissions or misinterpretation The information herein is subject to change without notification Copyright 1995 2019 by Geokon Doc Rev Q 05 01 19 ...

Page 2: ......

Page 3: ...nnel There are no warranties except as stated herein There are no other warranties expressed or implied including but not limited to the implied warranties of merchantability and of fitness for a particular purpose Geokon is not responsible for any damages or losses caused to other equipment whether direct indirect incidental special or consequential which the purchaser may experience as a result ...

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Page 5: ...403 READOUT BOX OBSOLETE MODEL 10 3 3 1 Connecting Sensors 10 3 3 2 Operating the GK 403 10 3 4 MEASURING TEMPERATURES 10 4 DATA REDUCTION 11 4 1 INCLINATION CALCULATION 11 4 2 TEMPERATURE CORRECTION 11 4 3 DEFLECTION CALCULATION 12 4 4 ENVIRONMENTAL FACTORS 12 5 TROUBLESHOOTING 13 APPENDIX A SPECIFICATIONS 14 A 1 VIBRATING WIRE TILT SENSOR 14 A 2 THERMISTOR SEE APPENDIX B ALSO 14 APPENDIX B THERM...

Page 6: ...EMO CONNECTOR TO GK 404 8 FIGURE 9 LIVE READINGS RAW READINGS 9 FIGURE 10 DEFLECTION INTERVALS 12 FIGURE 11 SAMPLE MODEL 6300 CALIBRATION REPORT 18 TABLES TABLE 1 MODEL 6300 TILT SENSOR SPECIFICATIONS 14 TABLE 2 THERMISTOR RESISTANCE VERSUS TEMPERATURE 15 EQUATIONS EQUATION 1 CALCULATION OF TILT LINEAR 11 EQUATION 2 CALCULATION OF TILT POLYNOMIAL 11 EQUATION 3 TEMPERATURE CORRECTION 11 EQUATION 4 ...

Page 7: ...e accurate measurement of inclination over segments in boreholes drilled into the structure being studied The continuous nature of the instrument allows for very precise measurement of changes in the borehole profile to be measured The instrument is installed in standard grooved inclinometer casing Figure 1 Figure 1 Model 6300 Tilt Sensor Assembly Plan View Sensor Housing Stationary Wheel Spring T...

Page 8: ...mbly to be lowered into the casing Swivel joints are included to prevent the wheel assemblies from running out of the casing grooves due to spiral problems Stainless steel tubing is used to connect the transducer and wheel assemblies together and the whole string is normally supported from the top of the casing Biaxial systems use two transducers mounted at 90 to each other To prevent damage durin...

Page 9: ...sistance between the gauge leads should be approximately 180 Ω 10 ohms Remember to add cable resistance when checking 22 AWG stranded copper leads are approximately 14 7Ω 1000 or 48 5Ω km multiply by two for both directions The resistance between the green and white leads varies with temperature Compare the measured resistance and ambient temperature to the factors shown in Table 2 in Appendix B T...

Page 10: ...on set such that the A direction marked on the sensor is aligned on the same side as the fixed wheel on the wheel assembly Tilts in the positive direction yield increasing readings in digits Vibrating wire tilt sensors are shipped with a clamp screw holding the internal pendulum mechanism so that it is not damaged in shipment A label is attached to each sensor emphasizing the importance of removin...

Page 11: ... sensor body at 90 clockwise from the upper sensor in plan looking down the casing This will be the B direction See Figure 6 Figure 6 Biaxial Sensor Orientation Note that there is some clearance around the bolt holes which will allow for some manual alignment of the sensors absolute alignment is not critical When the two sensors are connected the lower one is joined to the previously prepared gaug...

Page 12: ...for the rest of the cable The cables from the lower sensors should be taped or tie wrapped to the assembly at intervals to support them as the system is built up and lowered down the borehole Continue to add gauge tubing sensors and wheel assemblies until the last sensor has been attached to the upper wheel assembly which is pre assembled to the top suspension Figure 7 The Top suspension can then ...

Page 13: ...ely following this operation the seal screw should be replaced in the sensor 3 The sensor may now be lowered into the casing 2 4 Splicing and Junction Boxes Because the vibrating wire output signal is a frequency rather than current or voltage variations in cable resistance have little effect on gauge readings and therefore splicing of cables has little effect and in some case may be beneficial Fo...

Page 14: ... sensor conductors with blue representing the shield bare To turn the GK 404 on press the ON OFF button on the front panel of the unit The initial startup screen will be displayed After approximately one second the GK 404 will start taking readings and display them based on the settings of the POS and MODE buttons The unit display from left to right is as follows The current Position Set by the PO...

Page 15: ...s into place Connecting sensors with bare leads Attach the GK 403 2 flying leads to the bare leads of a Geokon vibrating wire sensor by connecting each of the clips on the leads to the matching colors of the sensor conductors with blue representing the shield bare 3 2 2 Operating the GK 405 Press the button labeled POWER ON A blue light will begin blinking signifying that the Remote Module is wait...

Page 16: ...position B 2 Turn the unit on 3 The readout will display the vibrating wire output in digits The last digit may change one or two digits while reading 4 The thermistor reading will be displayed above the gauge reading in degrees centigrade 5 Press the Store button to record the value displayed If the no reading displays or the reading is unstable see Section 5 for troubleshooting suggestions The u...

Page 17: ... second order curve to approximate the sine curve θ R2 A RB C degrees tilt Equation 2 Calculation of Tilt Polynomial Where A B and C are the coefficients supplied on the calibration report Calculate θ1 by substituting R R1 in the formula and then calculate θ0 by substituting R R0 then subtract to find the difference θ θ1 θ0 4 2 Temperature Correction The Model 6350 Tiltmeter has a slight temperatu...

Page 18: ...L4 sinθ4 L5 sinθ5 Where for small angles sinθ R1 R0 G Equation 4 Horizontal Displacement Calculation Although the system is designed for use with continuous segments and pivots the sensors can be installed without interconnecting tubing in standard round tubing or pipe using special friction anchoring In those systems the assumption is made that the measured deflection occurs over the segment leng...

Page 19: ... another tilt sensor If not the readout may have a low battery or be malfunctioning Symptom Tilt Sensor Fails to Read Is the cable cut or crushed This can be checked with an ohmmeter Nominal resistance between the two gauge leads usually red and black leads is 180Ω 10Ω Remember to add cable resistance when checking 22 AWG stranded copper leads are approximately 14 7Ω 1000 or 48 5Ω km multiply by t...

Page 20: ...mm Weight 1 5 lbs 0 7 kg Materials 304 Stainless Steel Electrical Cable Two twisted pair four conductor 22 AWG Foil shield PVC jacket nominal OD 6 3 mm 0 250 Table 1 Model 6300 Tilt Sensor Specifications Notes Consult the factory for other ranges Depends on readout equipment With averaging techniques it is possible to achieve one arc second Derived using 2nd order polynomial 4 The output from the ...

Page 21: ... 2 83 107 9 123 77 66K 36 8006 4 1363 44 331 5 84 105 2 124 72 81K 35 7618 5 1310 45 321 2 85 102 5 125 68 30K 34 7252 6 1260 46 311 3 86 99 9 126 64 09K 33 6905 7 1212 47 301 7 87 97 3 127 60 17K 32 6576 8 1167 48 292 4 88 94 9 128 56 51K 31 6265 9 1123 49 283 5 89 92 5 129 53 10K 30 5971 10 1081 50 274 9 90 90 2 130 49 91K 29 5692 11 1040 51 266 6 91 87 9 131 46 94K 28 5427 12 1002 52 258 6 92 8...

Page 22: ...ively narrow band for these sensors to maximize the stability and resolution of the output The frequency band for the full range is shown on the calibration reports The frequencies can be determined from these The highest and lowest frequencies shown can be used to determine the sweep parameters After initial readings are obtained parameters should be set to 200 Hz below the resonant frequency and...

Page 23: ...are supplied in a string connected together by pre determined lengths of cables specified by the customer The string of sensor is installed in a manner to that described in Section 2 The cable is connected via a 15 pin connector to a special Geokon Model 8021 1X datalogger modified by the addition of a Model 8031 Distributed Multiplexer specifically for use with the addressable system ...

Page 24: ...18 APPENDIX E TYPICAL CALIBRATION REPORT Figure 11 Sample Model 6300 Calibration Report ...

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